<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb>
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 消息提示 -->
      <el-alert
        title="添加商品信息"
        type="info"
        center
        show-icon
        :closable="false"
      ></el-alert>

      <!-- 步骤条 -->
      <el-steps
        :space="200"
        :active="activeIndex - 0"
        finish-status="success"
        align-center
      >
        <el-step title="基本信息" name="0"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- tabs -->
      <el-form
        :model="addForm"
        :rules="addFormrules"
        ref="addFormRef"
        label-width="100px"
        label-position="top"
      >
        <el-tabs
          v-model="activeIndex"
          :tab-position="'left'"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked"
        >
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <!-- 选择商品分类的级联选择框 -->
              <el-cascader
                v-model="addForm.goods_cat"
                :options="cateList"
                :props="cateProps"
                @change="handleChange"
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>

          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单item项 -->
            <el-form-item
              :label="item.attr_name"
              v-for="item in manyTableDate"
              :key="item.attr_id"
            >
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox
                  :label="cb"
                  v-for="(cb, i) in item.attr_vals"
                  :key="i"
                  border
                ></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item
              :label="item.attr_name"
              v-for="item in onlyTableDate"
              :key="item.attr_id"
            >
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- 图片上传 -->
            <!-- action 表示后台要上传的api地址 
                  on-preview 预览            
            -->
            <el-upload
              class="upload-demo"
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj"
              :on-success="handleSuccess"
            >
              <el-button size="small" type="primary">点击上传</el-button>
              <div slot="tip" class="el-upload__tip">
                只能上传jpg/png文件，且不超过500kb
              </div>
            </el-upload>
          </el-tab-pane>
          <!-- 商品内容 -->
          <el-tab-pane label="商品内容" name="4">
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 添加商品按钮 -->
            <el-button type="primary" class="btnAdd" @click="add"
              >添加商品</el-button
            >
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" alt="" class="previewImg" />
    </el-dialog>
  </div>
</template>
<script>
import _ from 'lodash'
export default {
  data() {
    return {
      //保存步骤条激活项索引
      activeIndex: '0',
      //添加商品表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        //商品所属分类数组
        goods_cat: [],
        //图片的数组
        pics: [],
        //商品介绍
        goods_introduce: '',
        attrs: [],
      },
      //验证规则
      addFormrules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' },
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' },
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' },
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' },
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' },
        ],
      },
      //商品分类列表
      cateList: [],
      //配置级联菜单中数据如何展示
      cateProps: {
        expandTrigger: 'hover',
        label: 'cat_name',
        value: 'cat_id',
        children: 'children',
      },
      //  动态参数列表
      manyTableDate: [],
      //商品静态属性列表
      onlyTableDate: [],
      //上传图片的地址
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      //图片上传附件headers请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token'),
      },
      //保存预览图片的url地址
      previewPath: '',
      //控制预览图片对话框的显示和隐藏
      previewVisible: false,
    }
  },
  created() {
    //商品分类数据
    this.getCateList()
  },

  methods: {
    //获取商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败')
      }
      this.cateList = res.data
      console.log(this.cateList)
    },
    //级联选择器选中项触发函数
    handleChange() {
      console.log(this.addForm.goods_cat)
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    //
    beforeTabLeave(activeName, oldActiveName) {
      //  console.log('即将离开的标签页名字是' + oldActiveName)
      //  console.log('即将进入的标签页名字是' + activeName)
      //  return false
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类')
        return false
      }
    },

    async tabClicked() {
      // console.log(this.activeIndex)
      //证明访问的是动态参数面板
      //判断激活面板是否等于1
      if (this.activeIndex === '1') {
        //发起请求
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: {
              sel: 'many',
            },
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('获取动态参数列表失败')
        }
        console.log(res.data)
        // 将attr_vals字符串转换为数组
        res.data.forEach((item) => {
          //将attr_vals进行分割
          //arrt_vals长度是否等于0 ?
          //如果等于0  返回一个空数组[]
          //否则进行分割 ：
          //将分割后的数组返回  item.attr_vals.split(' ')
          item.attr_vals =
            item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableDate = res.data
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: {
              sel: 'only',
            },
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('获取商品属性失败')
        }
        console.log(res.data)
        this.onlyTableDate = res.data
      }
    },

    //处理图片预览效果
    handlePreview(file) {
      console.log(file)
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    //处理移除图片的操作
    handleRemove(file) {
      console.log(file)
      //1.获取将要删除的图片临时路径
      const filePath = file.response.data.tmp_path
      //2.从 pics 数组中找到这个图片对应的索引
      const i = this.addForm.pics.findIndex((x) => x.pic === filePath)
      //3.调用 splice 方法把图片信息对象从pics数组中移除
      this.addForm.pics.splice(i, 1)
      console.log(this.addForm)
    },
    //监听图片上传成功事件
    handleSuccess(response) {
      console.log(response)
      //1.拼接得到一个图片信息对象
      const picInfo = {
        pic: response.data.tmp_path,
      }
      //2.将图片信息push到pics数组中
      this.addForm.pics.push(picInfo)
      console.log(this.addForm)
    },
    //添加
    add(){
         this.$refs.addFormRef.validate(async valid=>{
          if(!valid) return this.$message.error("请填写必要的表单项!")
          //将addForm进行深拷贝，避免goods_cat数组转换字符串之后导致级联选择器报错
          const form = _.cloneDeep(this.addForm)
          //将goods_cat从数组转换为"1,2,3"字符串形式
           form.goods_cat = form.goods_cat.join(',')

           //处理动态参数
           this.manyTableDate.forEach(item =>{
             const newInfo ={
               attr_id:item.attr_id,
               attr_valve:item.attr_vals.join('')         
             }
              this.addForm.attrs.push(newInfo)
           })

           //处理静态参数
           this.onlyTableDate.forEach(item=>{
             const newInfo = {
               attr_id:item.attr_id,
               attr_value:item.attr_vals
             }
             this.addForm.attrs.push(newInfo)
           })
           form.attrs = this.addForm.attrs
           console.log(form)

          const {data:res}= await this.$http.post('goods',form)
          if (res.meta.status !==201) {
            return this.$message.error('添加商品失败')
          }
          this.$message.success('添加商品成功')
          this.$router.push('/goods')
         })
    },
    
  },

  //添加计算属性获取三级分类
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    },
  },
}
</script>
<style lang="scss" scoped>
.el-checkbox {
  margin: 0 5px 0 0 !important;
}
.previewImg {
  width: 100%;
}
.btnAdd {
  margin-top: 15px;
}
</style>

